Steps:
1. Open the Constraint Manager, then go to the Electrical > Routing > Wiring spreadsheet.
2. In the Schedule column, you can right click your Dsn cell, create a new Electrical Constraint Set (ECS). Notice in the
image below, we have multiple ECSets already declared.
3. Select one of the cells within the Schedule column and you can choose your net topology from the drop-down menu
that appears.
These are the net topology options that are available:
f
Minimum Spanning Tree
f
Daisy-chain
f
Source-load Daisy-chain
f
Star
f
Far-end Cluster
f
(Clear)
Each topology has its own benefits, depending on the application. Apply the type to your Electrical Constraint Set (ECS) as
needed for your design.
4. Once you have set the topology for that ECSet, you can apply it to the appropriate nets found in the spreadsheet under
Electrical Constraint Set > Net > Routing > Wiring.
9 www.cadence.com
OrCAD X High-Speed Digital Design Guide
